#include<stdio.h>
int main()
{
    float a,b;
	char c;
	scanf("%f%c%f=",&a,&c,&b);
	switch(c)
	{
		case'+':printf("%.2f",a+b); break;
		case'-':printf("%.2f",a-b); break;
		case'*':printf("%.2f",a*b); break;
		case'/':printf("%.2f",a/b); break;
		default:printf("Input Error"); break;
	}
	return 0;
}
